The Ancient Magus' Bride Episode 4: Everything Must Have a Beginning.
Episode 4 of 24 of The Ancient Magus' Bride, aired October 29, 2017, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Long ago, the humans and cats of Ulthar, city of cats, were struck by a great tragedy. For generations, the souls of those who were at the center of this tragedy have been sealed away by the king of cats. Chise and Elias travel to Ulthar in order to complete Simon's second task: to purify the spirits that remain.